A certain device in a 100 V circuit has a current of 34 A flowing through it. What is the resistance of the device? Rearrange the equation Current = Voltage Resistance to express resistance in terms of current and voltage.

The resistance of the device is .

Explanation:

The expression for the voltage in terms of resistance and current is as follows:

V=IR

Here, I is the current, R is the resistance and V is the voltage.

It is given in the problem that a certain device in a 100 V circuit has a current of 34 A flowing through it.

Calculate the resistance by rearranging the above expression.

Put I= 34 A and V= 100 V.

Therefore, the resistance of the device is .

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.